Aristocratic scientist’s brother blocking degree over fabrication (2,7)

'aristocratic scientist's' is the definition.
I don't know anything about this answer so I cannot judge whether it can be defined by this definition.

'brother blocking degree over fabrication' is the wordplay.
'brother' becomes 'bro' (short for brother).
'blocking' is an insertion indicator (block can mean to plug a gap in something).
'degree over' becomes 'deg' (I can't explain this - if you can you should believe this answer much more).
'fabrication' becomes 'lie' (a lie is an invention or fabrication).
'bro' going inside 'deg' is 'debrog'.
'debrog'+'lie'='DE BROGLIE'

Can you help me to learn more?